Message-ID: <2001154D3B6D4DCD98B54D8D86E37E98@PCCasa>
From: "Daniele Tincani" <daniele.tincani@alice.it>
To: <rsgb_lf_group@blacksheep.org>
References: <AANLkTinG-0mJJ3CDqFwxeLXfOJXFFfs42gjLYz8yX3rW@mail.gmail.com>  <38A51B74B884D74083D7950AD0DD85E82A1C00@File-Server-HST.hst.e-technik.tu-darmstadt.de>  <AANLkTilyd93InqPvp5qUVkonthTgtMaIVqVfH3zyen2B@mail.gmail.com>  <Pine.LNX.4.64.1005252313060.26690@paranoid.lipkowski.org> <AANLkTimudswbmeqd9Ej52egRUOJ4RHIf5VtYiQ7_7d8T@mail.gmail.com> <Pine.LNX.4.64.1005281406110.26690@paranoid.lipkowski.org> <4BFFEECE.4040708@iup.uni-heidelberg.de> <4C00B3D8.40403@legal-medicine.de> <4C011C98.4020009@iup.uni-heidelberg.de>
In-Reply-To: <4C011C98.4020009@iup.uni-heidelberg.de>
Date: Sat, 29 May 2010 17:02:26 +0200
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Subject: LF: Re: VTX India @ 17 kHz
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Hi Stefan, VLF,
the M-Audio E-MU 0202 should work fairly good on USB and it costs arou=
nd 100=20
euros. It only needs a PC powerful enough to manage the CPU-consuming=
 USB=20
interface. This should not represent an issue with modern multi-core=
=20
processors.
For my next improvement I choose the older M-Audio Audiophile 2496 PCI=
=20
(96KHz max). About 75 euros on the bay. It also exists a version of 24=
96=20
with Firewire connection to the PC.
Some more details at following link:
http://www.telepostinc.com/soundcards.html
Regards
Daniele

----- Original Message -----=20
From: "Stefan Sch=E4fer" <Stefan.Schaefer@iup.uni-heidelberg.de>
To: <rsgb_lf_group@blacksheep.org>
Sent: Saturday, May 29, 2010 3:54 PM
Subject: VLF: VTX India @ 17 kHz


> Hello Peter,
>
> Tnx for your comments again! Yes, there are still some lines that sh=
ould
> not have to be where they are ;-) But anyway, it is the best recepti=
on i
> ever had. Now it's time to generate a test signal on the dreamers ba=
nd ;-)
>
> Also tnx for your last mail. You said i can receive VTX India @17 kH=
z.
> This is one transmitter that is very weak but visible anyway. The
> distance to me is 7795km. Very interesting: Type this in Google Eart=
h:
> "08.387015, 077.752762" and you can see the towers of the transmitte=
r...
> So, i spend a VTX window on the bottom of my 2nd grabber. VTX appear=
s up
> to 25dB above noise in 4,5mHz (equal to the DFCW-600 window). Slowly=
 i
> get fascinated by the whole VLF band ;-)
>
> Peter (or others), do you know a USB soundcard, that is able to run=
 at
> 96000 ksamples/s? There are a lot of USB soundcards that cost not ev=
en 5
> EUR and do a very good job (currently i am using such one) but most=
 of
> them have a filter for 48000 it seems...
>
>
> 73, Stefan/DK7FC
>
> Am 29.05.2010 08:27, schrieb pws:
>> Hi Stefan,
>>
>> You wrote:
>>
>>> ...
>>> Thus, the strong LF and MF broadcast signals are well attenuated,
>>> as it seems. I am interested what happens in the night, when QRM=
 goes
>>> down and the LF/MF DX window opens. The grabber2 is still availabl=
e at
>>> http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber2.h=
tml
>>>
>> Looking good, congrats! I wonder about that signal visible at 2100=
 Hz. It
>> shows a typical MSK-bandwidth and a diurnal run not unlike the othe=
rs
>> above. May be it's mirrored from next Nyquist-domain:
>> 24000 + (24000-2100) =3D 45900 =3D=3D>  NSY, Sicily, usually very=
 strong.
>>
>> Gruesse aus Kiel,
>> Peter
>>
>


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